ML20215F725
| ML20215F725 | |
| Person / Time | |
|---|---|
| Issue date: | 10/08/1986 |
| From: | Rubin A Office of Nuclear Reactor Regulation |
| To: | Speis T Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-44, REF-GTECI-EL, TASK-A-44, TASK-OR NUDOCS 8610160346 | |
| Download: ML20215F725 (4) | |
Text
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d OCT 0 81986 MEMORANDUM FOR: Themis P. Speis, Director Division of Safety Review & Oversight THRU: Warren Minners, Chief Reactor Safety Issues Branch Division of Safety Review & Oversight FROM: Alan Rubin, Senior Task Manager Reactor Safety Issues Branch Division of Safety Review & Oversight
SUBJECT:
SUMARY OF MEETINGS WITH NUGSB0 ON USI A-44 Dates: September 16 and October 1, 1986 Location: Bethesda, Md.
Attendees: NRC NUGSB0 W. Minnersi S. Maloney3 (Devonrue)
P. Norian2 M. McGarry 3 (Bishop, Liberman, A. Rubin 3 Cook, Purcell & Reynolds)
P. Barnowsky 3 M. Childersa (Northeast Utilitie;)
J. Flack 2 C. Ondash2 (Devonrue) 1 Attended meeting on Oct. 1 2 Attended meeting on Sept. 16 l 8 Attended both meetings
References:
(1) Memorandum for T. Speis from W. Minners, dated l
August 7, 1986 (2) Memorandum for T. Speis from A. Rubin, dated l
September 4, 1986 l (3) " Assessment of Coping Duration Requirements,"
Revision 1.0, Nuclear Utility Group on Station Blackout, August 1, 1986 (Enclosure to Reference 2)
(4) " Draft Regulatory Guide on Station Blackout," Task SI 501-4, March 1986 (4) Letter to Chairman Palladino from J. H. Miller, NUMARC, June 17, 1986
Background:
These were the third and fourth meetings with the staff and NUGSB0 to discuss NUMARC's initiatives on station blackout. (See References 1 and 2 for summaries of meetings held on July 29 and August 20, 1986, respectively.)
The purpose of these meetings were to discuss (1) the l,h
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8610160346 861008 / ( ,
PDR CTECI GELA-44 L
' OCT 0 81986 guidelines that NUMARC has sent to utilities to assess their station blackout coping requirements (Reference 3),
and (2) the status of NUMARC's initiatives on station blackout. The intent of these meetings was for NUGSB0 to feel confident that their guidance document is consistent
-with the staff's proposed resolution of USI A-44 to determine whether a nuclear plant falls into a 4- or 8-hour station blackout duration group (Reference 4).
Discussion: Meeting on September 16, 1986 This meeting focused on a discussion ct the staff's coments on NUGSB0's guidelines on station blackout coping requirements (Reference 3). In particular, the staff recomended that the definitions of " standby power supply" and " successful emergency diesel generator start" be
- modified to be consistent with the assumptions'and guidance developed under USI A-44. The staff also comented that the NUGSB0 guidance on calculating emergency diesel generator (EDG) failure rate should be based on the reliability of each individual EDG at the site rather than the average combined reliability of all standby AC power sources for the site. Discussions from pervious meetings continued to clarify further the terms and definitions used to determine offsite power design groups (e.g., independence and redundancy, treatment of severe weather).
NUGSBO's dircussion of the status of other industry initiatives to resolve the station blackout issue (listed in Reference 5) was postponed until after a meeting between NUSGB0 and NUMARC.
Meeting on October 1, 1986 Since the last meeting with the staff, NUGSB0 had met with NUMARC and therefore was able to provide additional information on the status of industry's initiatives. The discussions on each initiative are sumarized below.
Initiative No. 1 "Each utility will review their site (s) against the criteria specified in NUREG-1109, and if the site (s) fall into the category of an eight-hour site after utilizing all power sources available, the utility will take actions to reduce the site (s) contribution to the overall risk of station blackout. Non-nardware changes will be made within one year. Hardware changes will be made within a reasonable time thereafter." (Reference 5)
1 OCT 0 81986 NUSGB0 is planning two workshops with nuclear utilities (one on October 21 in Denver and the second shortly I thereatfer in Washington, D.C.) to discuss and answer questions on NUGSBO's gildance document (Reference 3) that had been sent to utilities to determine coping duration requirements. Based on discussions with the staff during this meeting and the previous three meetings, NUSGB0 will revise this document and send it to all utilities in advance of the workshops. NUMARC's schedule is to have all plants complete a coping duration assessment as part of Initiative Number 1 by November 25, 1986.
Initiative No. 2 "Each utility will implement procedures at each of its site (s) for:
- a. coping with a station blackout event,
- b. restoration of AC power following a station blackout event, and
- c. preparing the plant for severe weather conditions,
< such as hurricanes and tornados to reduce the likelihood and consequences of a loss of off-site power and to reduce the overall risk of a station blackout event."
(Reference 5)
As with Initiative Number 1, NbMARC plans to send guidelines to utilities on each of the three subparts of this initiative. NUGSB0 will develop these guidelines for NUMARC and will meet with NRC to discuss NRC's approach on these topics. NUGSB0 expects to have a draft of these guidelines by the end of 1986. They will focus initially on Initiative 2a because this will indicate how closely NUMARC's initiatives will agree with the staff's proposed resolution of USI A-44.
Initiative No. 3 "Each utility will, if applicable, reduce or elminiate cold fast-starts of emergency diesel generators for testing through changes to technical specifications or other appropriate means." (Reference 5)
This initiative relates to the objective in Generic Letter 84-15 of reducing cold fast-starts of EDGs. NUMARC will send a questionnaire to utilities to request information on the status of cold fast-starts at each plant. If a utility performs such tests more frequently than once in b
, OCT 0 81986 18 months, the utility will have to explain why such a~
schedule is followed. Industry responses to the questionnaire are expected by November 25, 1986, and NUGSB0 will provide the results to NRC.
Initiative No. 4 "Each utility will monitor emergency AC power unavailability utilizing data utilities provide to INP0 on a regular basis." (Reference 5)
This initiative is closely related to Generic Issue B-56, Diesel Generator Reliability. NUGSB0 intends to use an INP0 program on safety information monitoring to implement this initiative. The INP0 program covers other safety systems in addition to EDGs and will be used to monitor the performance of these systeins. Nine or ten plants will be involved in the INP0 pilot program through 1987, and then a decision will be made on participation on an industry-wide basis. In addition to monitoring performance, the program includes trend analysis and corrective actions, if necessary, to improve system reliability.
As NUGSB0 prepares guidance documents on Initiatives 2 through 4, they plan to meet with the staff periodically for discussions and information exchange. NUGSB0 will attempt to complete these documents by the end of 1986.
ISl Alan M. Rubin, Senior Task Manager Reactor Safety Issues Branch Division of Safety Review & Oversight cc: V. Stello H. Denton R. Vollmer Distribution G Central: File 3 RSIB R/F ARubin PNorian WMinners BSheron P8aranowsky MTaylor JFlack ARubin c/f PDR RSIB:DSR0 RS DSR0 RSIB 10 ARubin:slm PNorian WMinners 10/ 1 /86 10/')/86 10///86 M
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